CN104780522A - Method for supporting terminal in mobile access to LISP identifier bearing access network - Google Patents
Method for supporting terminal in mobile access to LISP identifier bearing access network Download PDFInfo
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- CN104780522A CN104780522A CN201510195782.3A CN201510195782A CN104780522A CN 104780522 A CN104780522 A CN 104780522A CN 201510195782 A CN201510195782 A CN 201510195782A CN 104780522 A CN104780522 A CN 104780522A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/08—Mobility data transfer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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Abstract
The invention discloses a method for supporting a terminal in mobile access to an LISP identifier bearing access network. The method comprises the following steps: when the terminal moves in the identifier bearing access network, registering the terminal on an XTR of a new access sub network, updating corresponding EID-RLOC mapping information on an MS and simultaneously updating or deleting a terminal position state recorded on the XTR of the access sub network, so that a data packet sent to the mobile terminal can be subjected to rerouting orientation accurately in the data communication process; through an XTR of an access sub network of a source terminal for sending data to the mobile destination terminal, the timely update of the corresponding EID-RLOC mapping buffer information of the mobile destination terminal inside the source terminal can be finished, so that the support for terminal mobility in the identifier bearing access network is realized. According to the method disclosed by the invention, the data packet only needs to be subjected to one-time encapsulation, and a triangular route is eliminated through the mapping update, so that the transmission time delay of the data sent to the mobile terminal is greatly reduced.
Description
Technical field
The present invention relates to a kind of LISP and identify the method that carrying Access Network support terminal moves access, belong to computer network and the communication technology.
Background technology
ICP/IP protocol is the procotol be most widely used at present, and TCP/IP network has advantages such as realizing simply, deployment is convenient, versatility is good, is widely used in the industry-by-industries such as education, government affairs, finance, national defence, traffic.But IP address innately has the double attribute of identity and position, as in network layer, IP address, as the station location marker of terminal, is used for carrying out route and the addressing of packet; And in application layer, IP address is again as the identify label of terminal, be used for establishing a communications link, so ICP/IP protocol all also exists remarkable shortcoming in fail safe, mobility etc., the marked net technology that study Internet working group proposes based on mark carrying for this reason attempts to solve current IP networks Problems existing.
The solution of marked net technology is mainly divided into based on terminal and edge Network Based two class.The former Typical Representative is HIP agreement and SHIM6 agreement, although wherein HIP agreement well achieves the support to terminal mobility, but because this quasi-protocol needs the ICP/IP protocol stack revising existing terminal, there is the problem with conventional network equipment poor compatibility, be therefore difficult to large scale deployment.The solution at edge Network Based is without the need to revising the ICP/IP protocol stack of existing terminal, can realize interconnecting with existing network and terminal very easily, be with a wide range of applications, but this quasi-protocol is to Shortcomings all the time in the support of terminal mobility.As the mobility of typical LISP protocol not support terminal itself, although its improve after agreement LISP_MN can well the mobility of support terminal, but need to carry out searching and twice data encapsulation of twice mapping server in whole communication process, and need to modify to existing terminal protocol stack, both added the propagation delay time of data, be unfavorable for again and existing network and hardware compatibility.The marked net solution at other edge Network Based also all also exists Similar Problems.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of LISP and identify the method that carrying Access Network support terminal moves access, it belongs to the marked net technical scheme at edge Network Based, by increasing local terminal location status table at the edge router of mark carrying Access Network, introduce mobile terminal register update and the mapping mechanism of tape terminal location status, ensure that the continuity to mobile terminal routing addressing, the basis not changing existing terminal protocol stack achieves the support to terminal mobility.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
LISP mark carrying Access Network support terminal moves a method for access, and the network system of this mark carrying Access Network comprises the network equipment and business device; The described network equipment comprises XTR and MS, and XTR is connected across between subnet and IP kernel heart net, and the port that the port that XTR connects IP kernel heart net uses RLOC, XTR to connect subnet uses EID, MS to be positioned at IP kernel heart net, and MS uses RLOC; Described business device comprises terminal, and business device is positioned at subnet, and business device uses EID; Edge router is called for short XTR, mapping server is called for short MS, mark carrying access subnet is called for short subnet, RLOC (routing locator is called for short in Traditional IP address, Route Distinguisher), terminal iidentification is called for short EID (end-identifier, terminal iidentification), and service customer end and service server are referred to as terminal;
Described EID has the hierarchical structure of geographic area character, and all ownership terminals in a subnet of a certain geographic area have identical EID prefix; The RLOC of described XTR and the EID of terminal has mapping relations, the RLOC of XTR be this XTR connect the whole network routing address that all terminals in subnet use in IP kernel heart net; The local edge router HOME-XTR of this terminal is called with the XTR that terminal has an identical EID prefix, the subnet that this XTR connects is called the home network of this terminal, in fast mobile terminal process, the XTR of the current subnet accessed is called the current edge router NOW-XTR of this terminal, belongs to edge router PRE-XTR before the XTR of the subnet accessed before NOW-XTR in fast mobile terminal process is called this terminal; The RLOC of HOME-XTR, NOW-XTR, PRE-XTR with the mapping relations of terminal EID in be called as Home-RLOC, Now-RLOC and Pre-RLOC respectively;
Have local terminal location status table in described XTR, have recorded the location status information of the terminal of resident mistake in this XTR, each contents in table comprises terminal EID, terminal Now-RLOC; EID-RLOC mapped cache table is had in described XTR, have recorded the used EID-RLOC map entry of this XTR, each contents in table comprises terminal EID, terminal Home-RLOC, terminal Now-RLOC, terminal Pre-RLOC and list item life span TTL, TTL occurs to be set to initial value when upgrading at affiliated map entry at every turn, then change by setting rule, when changing into another set point, this map entry can be deleted by XTR; EID-RLOC mapping table is had in described MS, store the EID-RLOC map entry of all terminals in its subnet managed, each contents in table comprises terminal EID, terminal Home-RLOC, terminal Now-RLOC, terminal Pre-RLOC, and Pre-RLOC when list item is set up for the first time is set to consistent with Now-RLOC;
The method that this support terminal moves access specifically comprises the steps:
Step one: endpoint registration
(11) XTR is to the EID of connected subnet periodic broadcast oneself, this EID is designated as XTR-EID, after in subnet, terminal receives XTR-EID, the default gateway address of itself and oneself is compared, if difference, can judge that this terminal is integrated in new subnet, enter step (12);
(12) default gateway address of oneself is updated to received XTR-EID by terminal, and to this XTR transmitting terminal XTR log-on message, enters step (13);
(13), after XTR receives terminal XTR log-on message, increase or upgrade the list item of this terminal in local terminal location status table therein, and according to contents in table transmitting terminal MS register update information to MS, enter step (14);
(14), after MS receives terminal MS register update information, increase in EID-RLOC mapping table therein or upgrade should the list item of terminal, and upgrading control information to corresponding XTR according to contents in table transmitting terminal location status;
Step 2: terminal data bag route
(21) when XTR receives the packet that the terminal in connected subnet sends, if the object terminal in discovery packet is just in this subnet, directly forward, otherwise check the list item with or without object terminal EID in the EID-RLOC mapped cache table of its inside, if without, by data pack buffer, enter step (22), otherwise enter step (23); This XTR is called source terminal XTR;
(22) source terminal XTR sends the map locating message of object terminal EID to MS, search in EID-RLOC mapping table therein after MS receives, and the map entry information found is returned to source terminal XTR, after source terminal XTR receives, this map entry information is added in EID-RLOC mapped cache table therein, enter step (23);
(23) source terminal XTR inquires about the EID-RLOC mapped cache table of its inside, using the Now-RLOC in the map entry information of corresponding object terminal EID as destination address, send to IP kernel heart net after IP tunnel encapsulation is carried out to packet, enter step (24);
(24) after the XTR having a Now-RLOC receives IP tunnel packet, first according to the local terminal location status table look-up object terminal of its inside whether in local subnet, if; packet solution would be honored as a queen and would mail to object terminal; If leave local subnet, then this XTR becomes the PRE-XTR of object terminal, and the XTR having the RLOC in its local terminal location status table in corresponding object terminal EID list item is then the NOW-XTR of object terminal, enters step (25);
(25) packet is re-started the NOW-XTR that IP tunnel encapsulation sends to object terminal by the PRE-XTR of object terminal, in the packet of Reseal, source address remains unchanged, destination address changes the RLOC of Now-XTR into, PRE-XTR sends object terminal EID-RLOC map updating information to source terminal XTR simultaneously, enters step (26);
(26), after source terminal XTR receives object terminal EID-RLOC map updating information, the map entry of corresponding object terminal EID in the EID-RLOC mapped cache table of its inside is upgraded.
Concrete, in described step (12), the terminal XTR log-on message that terminal sends to XTR comprises terminal EID.
Concrete, in described step (13), when XTR increases or upgrades list item in the location status table of local terminal, if in the location status table of local terminal during the list item of not this terminal, increase, if when having the list item of this terminal in the location status table of local terminal, upgrade, the terminal Now-RLOC inserted in list item is the RLOC of this XTR.
Concrete, in described step (13), the terminal MS register update information that XTR sends to MS comprises terminal EID and terminal Now-RLOC.
Concrete, in described step (14), when MS increases in EID-RLOC mapping table therein or upgrades list item, increasing when the list item of not this terminal in inner EID-RLOC mapping table, then upgrading when having during the list item of this terminal in inner EID-RLOC mapping table; Now-RLOC and the Pre-RLOC Now-RLOC in terminal MS register update information inserted in counterpart terminal EID list item during increase; Be the Now-RLOC replaced with by the Pre-RLOC in counterpart terminal EID list item in this list item former during renewal, the Now-RLOC in list item replaces with the Now-RLOC in terminal MS register update information.
Concrete, in described step (14), MS sends to the content of the terminal location state updating control information of XTR to comprise terminal EID, terminal Now-RLOC and message categories; Message categories has renewal and deletes two kinds; When the EID-RLOC mapping item of counterpart terminal EID in MS is for setting up for the first time, MS does not upgrade control information to any XTR transmitting terminal location status; When Now-RLOC in the former EID-RLOC mapping item of counterpart terminal EID in MS is different with the Now-RLOC in terminal MS register update information, MS sends to the XTR having Home-RLOC and Now-RLOC in former EID-RLOC mapping item and upgrades control message, terminal Now-RLOC in message is the Now-RLOC in terminal MS register update information, after corresponding XTR receives, the Now-RLOC in counterpart terminal EID list item in the location status table of local terminal is updated to the Now-RLOC in the renewal control information received; If the Pre-RLOC in former EID-RLOC mapping item and the Home-RLOC in former EID-RLOC mapping item, with the NOW-RLOC in former EID-RLOC mapping item, not identical with the Now-RLOC in terminal MS register update information time, then MS sends to the XTR having Pre-RLOC in former EID-RLOC mapping item and deletes control information, is deleted by the list item of counterpart terminal EID in its local terminal location status table after corresponding XTR receives.
Concrete, in described step (22), the content of the object terminal EID map locating message that source terminal XTR sends to MS, comprises object terminal EID.
Concrete, in described step (25), send to the object terminal EID-RLOC map updating information of source terminal XTR to comprise the Now-RLOC of object terminal.
Concrete, in described step (26), source terminal XTR is to the renewal of its local EID-RLOC mapped cache table, be the Now-RLOC replaced with by the Pre-RLOC in object terminal EID list item corresponding in mapped cache table in this list item former, the Now-RLOC in list item replaces with the Now-RLOC in object terminal EID-RLOC map updating information.
Beneficial effect: mark carrying Access Network support terminal provided by the invention moves the method for access, have and realize advantage that is simple, that easily dispose, specific as follows: 1, when terminal is not moved in a network, the data communication mechanism of terminal room is similar with LISP protocol; 2, by introducing register update and the mapping mechanism of tape terminal location status, ensure that the continuity to mobile terminal routing addressing in marked net; 3, this method does not need to modify to terminal protocol stack, has good compatibility to existing network, is easy to dispose; 4, only once need encapsulate packet in communication process, and eliminate Triangle routing by map updating, greatly reduce the propagation delay time of mobile terminal data.
Accompanying drawing explanation
Fig. 1 is the schematic network structure of mark carrying Access Network in embodiment;
Fig. 2 is the list item structural representation of the local terminal location status table in XTR;
Fig. 3 is the list item structural representation of the EID-RLOC mapped cache table in XTR;
Fig. 4 is the list item structural representation of the EID-RLOC mapping table in MS;
Fig. 5 is that the fast mobile terminal in embodiment is registered and communication data packet redirection of router process schematic.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Be illustrated in figure 1 the schematic network structure of LISP mark carrying Access Network.In figure, MS is the mapping server in network; MN1, MN2 are mobile terminal, and both terminal iidentification addresses are respectively EID1 and EID2, and home sub-net is respectively mark access subnet Site A and Site B; XTR1, XTR 2, XTR 3, XTR 4, XTR 5 are respectively the edge router of mark access subnet Site A, Site B, Site C, Site D, Site E, corresponding RLOC address is RLOC1, RLOC2, RLOC3, RLOC43, RLOC5 respectively, and corresponding EID address is respectively XTR-EID1, XTR-EID 2, XTR-EID 3, XTR-EID 4, XTR-EID 5.In conjunction with this example, real-time process of the present invention is described.
Step one: after the first access network of MN1, MN2, first needs to send log-on message to accessed XTR and MS, and respectively in home sub-net access both supposing, then the mapping status about both in XTR1, XTR2 and MS is respectively:
● corresponding EID1 list item in the local terminal location status table of XTR1: (EID1---RLOC1);
● corresponding EID2 list item in the local terminal location status table of XTR2: (EID2---RLOC2);
● corresponding EID1 list item in the EID-RLOC mapping table of MS: (EID1---RLOC1, RLOC1, RLOC1);
● corresponding EID2 list item in the EID-RLOC mapping table of MS: (EID2---RLOC2, RLOC2, RLOC2).
When step 2: MN1 and MN2 occurs to communicate for the first time, owing to still there is no the EID-RLOC map entry of the other side in the EID-RLOC mapped cache table of respective accessed XTR, so query messages can be sent to MS.After both complete communication, the mapping status about both in XTR1 and XTR2 is respectively:
● corresponding EID2 list item in the EID-RLOC mapped cache table of XTR1: (EID2---RLOC2, RLOC2, RLOC2) (omitting the TTL in list item, lower same);
● corresponding EID1 list item in the EID-RLOC mapped cache table of XTR2: (EID1---RLOC1, RLOC1, RLOC1).
, following mobile register flow path can be there is in step 3: when MN2 moves into Site C:
(1) MN2 receives the XTR-EID 3 of XTR3 broadcast;
(2) MN2 finds that XTR-EID 3 is inconsistent with the default gateway address XTR-EID 2 of oneself, judges that oneself there occurs movement, so using the default gateway address of XTR-EID 3 as oneself, and to XTR 3 transmitting terminal XTR log-on message;
(3), after XTR 3 receives the terminal XTR log-on message of MN2, increase the list item of MN2 in local terminal location status table therein, and transmitting terminal MS register update information is to MS;
(4) MS receive that XTR3 sends about after the terminal MS register update information of MN2, upgraded by the list item of corresponding MN2 in its inner EID-RLOC mapping table, concurrent end position state table of making arrangements for his funeral upgrades control information to XTR 2.
After above-mentioned mobile register flow path completes, there is following change in the mapping status in MS, XTR2, XTR3 respectively:
● corresponding EID2 list item in the local terminal location status table of XTR2: (EID2---RLOC3);
● corresponding EID2 list item in the local terminal location status table of XTR3: (EID2---RLOC3);
● corresponding EID2 list item in the EID-RLOC mapping table of MS: (EID2---RLOC2, RLOC3, RLOC2).
Step 4: when MN1 and MN2 continues communication, when MN1 mails to the packet arrival XTR1 of MN2, if the list item of corresponding EID2 lost efficacy in the EID-RLOC mapped cache table of XTR1, then XTR1 can send Query Information to MS, packet according to the map locating object information returned, is directly encapsulated the XTR3 being sent to the current access of MN2 subsequently; If the list item of corresponding EID2 did not lose efficacy, then packet encapsulation can be sent to XTR2 according to contents in table by XTR1, XTR2 checks local terminal location status table, find that MN2 has moved to Site C, then XTR2 is forwarded to XTR3 by after packet Reseal, and send EID-RLOC map updating message to XTR1, XTR1 completes the mapping status after corresponding renewal and is:
● corresponding EID2 list item in the EID-RLOC mapped cache table of XTR1: (EID2---RLOC2, RLOC3, RLOC2).
After this, before movement is not linked into new subnet to MN2, the packet that MN1 mails to MN2 all according to the EID-RLOC mapped cache table list item in XTR1, directly can encapsulate and is sent to XTR3.
The fast mobile terminal registration of above-mentioned steps three and step 4 and the visible Fig. 5 of communication data packet redirection of router process schematic.
Step 5: when MN2 be again moved enter Site D time, can continue cause send out fast mobile terminal register flow path as previously mentioned.After mobile registration completes, there is following change in the mapping status in MS, XTR2, XTR3, XTR4 respectively:
● corresponding EID2 list item in the local terminal location status table of XTR2: (EID2---RLOC4);
● corresponding EID2 list item in the local terminal location status table of XTR3: (EID2---RLOC4);
● corresponding EID2 list item in the local terminal location status table of XTR4: (EID2---RLOC4);
● corresponding EID2 list item in the EID-RLOC mapping table of MS: (EID2---RLOC2, RLOC4, RLOC3).
Step 6: when MN1 and MN2 continues communication, when MN1 mails to the packet arrival XTR1 of MN2, if the list item of corresponding EID2 did not lose efficacy (failed situation repeats no more) in the EID-RLOC mapped cache table of XTR1, then packet encapsulation can be sent to XTR3 according to contents in table by XTR1, XTR3 checks local terminal location status table, find that MN2 has moved to Site D, then XTR3 is forwarded to XTR4 by after packet Reseal, and send EID-RLOC map updating message to XTR1, the mapping status that XTR1 completes corresponding renewal is:
● corresponding EID2 list item in the EID-RLOC mapped cache table of XTR1: (EID2---RLOC2, RLOC4, RLOC3).
After this, before movement is not linked into new subnet to MN2, the packet that MN1 mails to MN2 all according to the EID-RLOC mapped cache table list item in XTR1, directly can encapsulate and is sent to XTR4.
Above-mentioned steps five and step 6 fast mobile terminal registration and communication data packet redirection of router process schematic and Fig. 5 similar, repeat no more.
Step 7: when MN2 be again moved enter Site E time, can continue cause send out fast mobile terminal register flow path as previously mentioned.After mobile registration completes, there is following change in the mapping status in MS, XTR2, XTR3, XTR4, XTR5 respectively:
● corresponding EID2 list item in the local terminal location status table of XTR2: (EID2---RLOC5);
● in the local terminal location status table of XTR3, corresponding EID2 list item is deleted;
● corresponding EID2 list item in the local terminal location status table of XTR4: (EID2---RLOC5);
● corresponding EID2 list item in the local terminal location status table of XTR5: (EID2---RLOC5);
● corresponding EID2 list item in the EID-RLOC mapping table of MS: (EID2---RLOC2, RLOC5, RLOC4).
Step 8: when MN1 and MN2 continues communication, when MN1 mails to the packet arrival XTR1 of MN2, if the list item of corresponding EID2 did not lose efficacy (failed situation repeats no more) in the EID-RLOC mapped cache table of XTR1, then packet encapsulation can be sent to XTR4 according to contents in table by XTR1, XTR4 checks local terminal location status table, find that MN2 has moved to Site E, then XTR4 is forwarded to XTR5 by after packet Reseal, and send EID-RLOC map updating message to XTR1, the mapping status that XTR1 completes corresponding renewal is:
● corresponding EID2 list item in the EID-RLOC mapped cache table of XTR1: (EID2---RLOC2, RLOC5, RLOC4).
After this, before movement is not linked into new subnet to MN2, the packet that MN1 mails to MN2 all according to the EID-RLOC mapped cache table list item in XTR1, directly can encapsulate and is sent to XTR5.
Above-mentioned steps five and step 6 fast mobile terminal registration and communication data packet redirection of router process schematic and Fig. 5 similar, repeat no more.MN2 is describe only when moving in above-described embodiment, it moves registration and MN1 sends to the redirection of router process of MN2 data, if MN1 also moves simultaneously, then MN1 moves registration and MN2 sends to the redirection of router process of MN1 data similar with it, more may extend in network the situation having more mark carryings to access subnets and multiple terminal to move simultaneously and intercom mutually.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. LISP mark carrying Access Network support terminal moves a method for access, it is characterized in that: the network system of this mark carrying Access Network comprises the network equipment and business device; The described network equipment comprises XTR and MS, and XTR is connected across between subnet and IP kernel heart net, and the port that the port that XTR connects IP kernel heart net uses RLOC, XTR to connect subnet uses EID, MS to be positioned at IP kernel heart net, and MS uses RLOC; Described business device comprises terminal, and business device is positioned at subnet, and business device uses EID; Edge router is called for short XTR, and mapping server is called for short MS, and mark carrying access subnet is called for short subnet, and RLOC is called for short in Traditional IP address, and terminal iidentification is called for short EID, and service customer end and service server are referred to as terminal;
Described EID has the hierarchical structure of geographic area character, and all ownership terminals in a subnet of a certain geographic area have identical EID prefix; The RLOC of described XTR and the EID of terminal has mapping relations, the RLOC of XTR be this XTR connect the whole network routing address that all terminals in subnet use in IP kernel heart net; The local edge router HOME-XTR of this terminal is called with the XTR that terminal has an identical EID prefix, the subnet that this XTR connects is called the home network of this terminal, in fast mobile terminal process, the XTR of the current subnet accessed is called the current edge router NOW-XTR of this terminal, belongs to edge router PRE-XTR before the XTR of the subnet accessed before NOW-XTR in fast mobile terminal process is called this terminal; The RLOC of HOME-XTR, NOW-XTR, PRE-XTR with the mapping relations of terminal EID in be called as Home-RLOC, Now-RLOC and Pre-RLOC respectively;
Have local terminal location status table in described XTR, have recorded the location status information of the terminal of resident mistake in this XTR, each contents in table comprises terminal EID, terminal Now-RLOC; EID-RLOC mapped cache table is had in described XTR, have recorded the used EID-RLOC map entry of this XTR, each contents in table comprises terminal EID, terminal Home-RLOC, terminal Now-RLOC, terminal Pre-RLOC and list item life span TTL, TTL occurs to be set to initial value when upgrading at affiliated map entry at every turn, then change by setting rule, when changing into another set point, this map entry can be deleted by XTR; EID-RLOC mapping table is had in described MS, store the EID-RLOC map entry of all terminals in its subnet managed, each contents in table comprises terminal EID, terminal Home-RLOC, terminal Now-RLOC, terminal Pre-RLOC, and Pre-RLOC when list item is set up for the first time is set to consistent with Now-RLOC;
The method that this support terminal moves access specifically comprises the steps:
Step one: endpoint registration
(11) XTR is to the EID of connected subnet periodic broadcast oneself, this EID is designated as XTR-EID, after in subnet, terminal receives XTR-EID, the default gateway address of itself and oneself is compared, if difference, can judge that this terminal is integrated in new subnet, enter step (12);
(12) default gateway address of oneself is updated to received XTR-EID by terminal, and to this XTR transmitting terminal XTR log-on message, enters step (13);
(13), after XTR receives terminal XTR log-on message, increase or upgrade the list item of this terminal in local terminal location status table therein, and according to contents in table transmitting terminal MS register update information to MS, enter step (14);
(14), after MS receives terminal MS register update information, increase in EID-RLOC mapping table therein or upgrade should the list item of terminal, and upgrading control information to corresponding XTR according to contents in table transmitting terminal location status;
Step 2: terminal data bag route
(21) when XTR receives the packet that the terminal in connected subnet sends, if the object terminal in discovery packet is just in this subnet, directly forward, otherwise check the list item with or without object terminal EID in the EID-RLOC mapped cache table of its inside, if without, by data pack buffer, enter step (22), otherwise enter step (23); This XTR is called source terminal XTR;
(22) source terminal XTR sends the map locating message of object terminal EID to MS, search in EID-RLOC mapping table therein after MS receives, and the map entry information found is returned to source terminal XTR, after source terminal XTR receives, this map entry information is added in EID-RLOC mapped cache table therein, enter step (23);
(23) source terminal XTR inquires about the EID-RLOC mapped cache table of its inside, using the Now-RLOC in the map entry information of corresponding object terminal EID as destination address, send to IP kernel heart net after IP tunnel encapsulation is carried out to packet, enter step (24);
(24) after the XTR having a Now-RLOC receives IP tunnel packet, first according to the local terminal location status table look-up object terminal of its inside whether in local subnet, if; packet solution would be honored as a queen and would mail to object terminal; If leave local subnet, then this XTR becomes the PRE-XTR of object terminal, and the XTR having the RLOC in its local terminal location status table in corresponding object terminal EID list item is then the NOW-XTR of object terminal, enters step (25);
(25) packet is re-started the NOW-XTR that IP tunnel encapsulation sends to object terminal by the PRE-XTR of object terminal, in the packet of Reseal, source address remains unchanged, destination address changes the RLOC of Now-XTR into, PRE-XTR sends object terminal EID-RLOC map updating information to source terminal XTR simultaneously, enters step (26);
(26), after source terminal XTR receives object terminal EID-RLOC map updating information, the map entry of corresponding object terminal EID in the EID-RLOC mapped cache table of its inside is upgraded.
2. LISP mark carrying Access Network support terminal according to claim 1 moves the method for access, and it is characterized in that: in described step (12), the terminal XTR log-on message that terminal sends to XTR comprises terminal EID.
3. LISP mark carrying Access Network support terminal according to claim 1 moves the method for access, it is characterized in that: in described step (13), when XTR increases or upgrades list item in the location status table of local terminal, if in the location status table of local terminal during the list item of not this terminal, increase, if when having the list item of this terminal in the location status table of local terminal, upgrade, the terminal Now-RLOC inserted in list item is the RLOC of this XTR.
4. LISP mark carrying Access Network support terminal according to claim 1 moves the method for access, and it is characterized in that: in described step (13), the terminal MS register update information that XTR sends to MS comprises terminal EID and terminal Now-RLOC.
5. LISP mark carrying Access Network support terminal according to claim 1 moves the method for access, it is characterized in that: in described step (14), when MS increases in EID-RLOC mapping table therein or upgrades list item, increasing when the list item of not this terminal in inner EID-RLOC mapping table, then upgrading when having during the list item of this terminal in inner EID-RLOC mapping table; Now-RLOC and the Pre-RLOC Now-RLOC in terminal MS register update information inserted in counterpart terminal EID list item during increase; Be the Now-RLOC replaced with by the Pre-RLOC in counterpart terminal EID list item in this list item former during renewal, the Now-RLOC in list item replaces with the Now-RLOC in terminal MS register update information.
6. LISP mark carrying Access Network support terminal according to claim 1 moves the method for access, it is characterized in that: in described step (14), MS sends to the content of the terminal location state updating control information of XTR to comprise terminal EID, terminal Now-RLOC and message categories; Message categories has renewal and deletes two kinds; When the EID-RLOC mapping item of counterpart terminal EID in MS is for setting up for the first time, MS does not upgrade control information to any XTR transmitting terminal location status; When Now-RLOC in the former EID-RLOC mapping item of counterpart terminal EID in MS is different with the Now-RLOC in terminal MS register update information, MS sends to the XTR having Home-RLOC and Now-RLOC in former EID-RLOC mapping item and upgrades control message, terminal Now-RLOC in message is the Now-RLOC in terminal MS register update information, after corresponding XTR receives, the Now-RLOC in counterpart terminal EID list item in the location status table of local terminal is updated to the Now-RLOC in the renewal control information received; If the Pre-RLOC in former EID-RLOC mapping item and the Home-RLOC in former EID-RLOC mapping item, with the NOW-RLOC in former EID-RLOC mapping item, not identical with the Now-RLOC in terminal MS register update information time, then MS sends to the XTR having Pre-RLOC in former EID-RLOC mapping item and deletes control information, is deleted by the list item of counterpart terminal EID in its local terminal location status table after corresponding XTR receives.
7. LISP mark carrying Access Network support terminal according to claim 1 moves the method for access, it is characterized in that: in described step (22), the content of the object terminal EID map locating message that source terminal XTR sends to MS, comprises object terminal EID.
8. LISP mark carrying Access Network support terminal according to claim 1 moves the method for access, it is characterized in that: in described step (25), send to the object terminal EID-RLOC map updating information of source terminal XTR to comprise the Now-RLOC of object terminal.
9. LISP mark carrying Access Network support terminal according to claim 1 moves the method for access, it is characterized in that: in described step (26), source terminal XTR is to the renewal of its local EID-RLOC mapped cache table, be the Now-RLOC replaced with by the Pre-RLOC in object terminal EID list item corresponding in mapped cache table in this list item former, the Now-RLOC in list item replaces with the Now-RLOC in object terminal EID-RLOC map updating information.
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| CN115426685A (en) * | 2022-08-31 | 2022-12-02 | 中国联合网络通信集团有限公司 | Access control method, device, equipment and medium for 5G edge computing flow |
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